We can use any characters from any show/movie/video game to type an idea for a flashback joke. Images, descriptions, dialogue, videos, etc. can be used to convey the ideas. Be as flamboyant and creative as you desire. I'll start just using a normal Family Guy setup:
Peter: Come on Lois we don't need to pay for some repairman to fix the car. Remember that time I helped Bob the Builder when he crashed his car.
picture of Bob the Builder standing beside his crashed car
Bob the Builder: Oh god I haven't paid the mortgage and this car was a rental I only know how to fix buildings how the hell am I supposed to fix a car!
Peter: Wow, wow, take it easy I happen to know a thing or two about cars. You see, if a car has a dent in it, you have to just push the dent back out with an equal amount of force. So I'm gonna ram my car into it.
Bob the Builder: What!?
Peter: rams his car into Bob the Builder's car
Bob the Builder: weeping on his knees
Peter: You know this did not quite go how I thought it would.
Bob the Builder: I can't fix it. blubbers I can't fix it!